Improvement in coal-drills



SAMUEL Il. `AlDL-U)'I)NC)\Y, OF S'I. CLAIR, SYLVANIA.

. lNllROVE'MENTIN C'OAL-DRILLS.

Specilicatien forming partof'Lcttcs Patent No. 1.51.65l, dated June 9 1874; application lilcd Y May 14,1374.

To all whom t may concern:

Be it known that I, SAMUEL HARRIES DAD- DoW, of St. Clair, county of Schuylkill and State of Pennsylvania, have invented certain new and useful Improvements in Drills for Stone and Coal, of which the following is a specification The nature of my invention consists in the construction and arrangement of a drill for drilling holes in coal, rock, &c., for the purpose of blasting in mines, quarries, &c., as will be hereinafter more fully set forth.

In the accompanying drawing, Figure l is aside view of my entire drill. Fig. 2 is a longitudinal section of the tamping-head. Fig. 3 is a similar View of an elongated nut used in connecting the sections of the drill-shaft. Fig. 4 is a similar section of the drill-head. Figs. 5, 6, and 7 are detached views of certain parts of the drill; and Fig. S is a side View of the drill, withthe tamping-head and nut removed.

A represents the steel head or bit, provided with teeth a a, like a hollow saw, which teeth may be either permanent in the head or be inserted, as represented by the tooth shown in Fig. 7 In the interior of the drill-head A is a valve, b, held in place by a pin, d, as shown in Fig. 6. This valve is dropped into place through the upper or outer end of the drillhead before the tube B is inserted. The object of the valve b is to bring up the core or cuttings in steep holes. It may be taken out at pleasure when not needed. C represents a long hollow nut, of any suitable dimensions. All or part of the drill-bar or hollow tube B is provided with screw-threads to fit the nut C, and it may be made in two sections, as shown in Fig. S, the part nearest the drillhead being made smooth. The two sections then screw into the nut from opposite ends and meet at or near the center thereof. This arrangement is to admit of different cuttingtools, which may be of any form or style desired when thus in two separate pieces; and also that the more elaborate work on the outer part of the tube, the nut, and the tampinghead may not interfere with the cost of building or making the drill, in order to secure greater variety in the size, length, and weight of the drill. The head A may also be changed at pleasure, in order to get a large or small hole with the'saine tool.. The nut C-is provided with steel tap'at e, the threads on which are formed with cutting edges or teeth, in order to eut and clear a corresponding thread in whatever substance it lnay be fixed, in order to hold it firmly against the drill when in operation. On this nut is placed a friction or pressure jam-nut, j', which may be of rubber, or any. other elastic substance, which is forced outward, increasingits diameter and shortening its length when the nut C is secured firmly into the drill-hole. The nut C may be held by, or attached to, a post when the drilling is conducted in a coal-bed, the post being held between the top and bottom slats.

A hole is first drilled by the jumping or percussive action to the depth of about twelve inches, lnore or less. Into this hole the nut C is forced by turning it by a crank, G, which is fastened on a square projection, h, at the outer end of the nut, the crank being slipped over the drill-bar through a slot in the crank. rlhe cuttings made in the coal or rock by the teeth c are forced into the drill-bar through a hole, l

fi, between the teeth, or cleared by any other device. Then the nut C is firmly secured into the mouth of the drill-hole the nut f is forced out againstthe sides of the hole, while the teeth e are firmly set in corresponding grooves or threads. Thus the nut is fixed ready for the operation of rotating the drill. Tile crank G is then slid back. on the square part of the tamping-head D at m. The core or cutting from the bit A is forced through the hollow drill-bar B and falls out at a slot, n, in the tamping-head D. rlhe operation, however, of drilling may be conducted by any operation of jumping or percussion, the core and cutting falling out in the same manner through the slot n. 'Ihe nut O, in that ease, is held firmly in one hand, or it may be gradually turned as the hole progresses. The tampinghead Dis used for tampin g the hole and pushing in the cartridge or powder. rIhe slot or hole s in the side of the head is to admit the use ofthe miners-ncedle or the blasting-barrel now in common use. The hole t in the end of the head D is designed to admit the use of a fuse in the center of the hole instead of the sides, as now practiced, to ob- Viatc the danger of igniting it by striking fire against the sides of the hole, which is a very frequent occurrence, and also to attach the fuse in the center of the cartridge instead of the side, as is now attempted, whereby the cartridgeis frequently torn, because the fuse is generally nearer the center than the side, and when the tainp is forced against the end of the cartridge the fuse is forced to the side, and the danger of tearing it is great, which, in a wet hole, always causes failure. The hole t, however, may be used in any hollow drill, and may be used or not, as desired. By a small set-screw in the hole it may be opened or closed at pleasure.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The elongated nut C, provided with cutting-threads e on the outside, the elastic jamnut f, and square or round end h, substantially as and for the purposes herein set forth.

2. The tamping-head D, provided with the slot n, slot or hole s, and hole t, substantially as and for the purposes herein set forth.

3. The combination of the drill-head A, hollow drill-bar B, elongated nut C, and tampin ghead D, all constructed substantially as and for the purposes herein set forth.

In testimony that I claim the foregoing as my invention Ihereunto aix my signature this 23d day of April, 187 4.

SAMUEL HARRIES DADDOW.

Witnesses SAML. EINER, Mnnnnrrn L. JONES. 

